Typhoon Chanthu (2021)

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Saffir–Simpson scale
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
Disc Plain black.svg Tropical cyclone
Solid black.svg Subtropical cyclone
ArrowUp.svg Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

At 06:00 UTC on September 5, the JTWC began to monitor an area of disturbed weather that had formed 446 nmi (513 mi; 826 km) from Legazpi, Philippines. [3] At 18:00 UTC the same day, the JMA declared the system a tropical depression. [4] Later in the day, the JTWC issued a Tropical Cyclone Formation Alert as the system's low-level circulation center and its surrounding convection had improved significantly in organization. [5] At 09:00 UTC the next day, the JTWC upgraded the disturbance to a tropical depression, designating as 19W. [6] At 21:00 UTC, the JTWC upgraded it to a tropical storm; they also noted the formation of an eye-like feature on satellite images. [7] The JMA later did the same at 00:00 UTC of September 7, providing the name Chanthu. [8] At 09:30 UTC, the PAGASA reported that Chanthu entered the Philippine Area of Responsibility (PAR) and was named Kiko. [9] At 12:00 UTC, as satellite based intensity estimates from the Dvorak technique increased, the JMA upgraded Chanthu to a severe tropical storm. [10] At the same moment, Chanthu started rapid intensification as it quickly became a Category 1-equivalent typhoon. Satellite imagery indicate a development of a vertical hot tower over its center, with microwave imagery indicating that it had developed a very small eye feature. [11] [12] At 15:00 UTC, it had become a Category 2-equivalent typhoon, as it continued explosive intensification. A pinhole eye, a typical sign of a rapidly intensifying tropical cyclone, had developed by that time. [13] Six hours later, the typhoon reached Category 4 status, with one-minute sustained wind speeds of 125 kn (230 km/h; 145 mph). [14] By the next day, at 09:00 UTC, Chanthu had reached Category 5-equivalent intensity, developing a 5 nmi (10 km; 5 mi)-wide eye which was by very intense convection, [15] [16] making it the second super typhoon of the year and marking the storm's initial peak intensity.

Tropical Storm Conson (left) and Typhoon Chanthu at its initial peak. (right) on September 8. Chanthu and Conson 2021-09-08 0000Z.png
Tropical Storm Conson (left) and Typhoon Chanthu at its initial peak. (right) on September 8.

After reaching its initial peak, Chanthu was downgraded to a Category 4-equivalent super typhoon at 09:00 UTC on September 9, as its highly compact eye started to become cloud-filled, indicating the start of an eyewall replacement cycle. [17] However, shortly after, Chanthu quickly re-intensified into a Category 5-equivalent super typhoon yet again at 09:00 UTC that day, as its eye became clear again. [18] On 05:00 PhST of September 11 (21:00 UTC of September 10), the PAGASA reported that Chanthu passed to the east of the Babuyan Islands; [19] at 08:30 PhST (00:30 UTC), Chanthu made landfall in Ivana, Batanes as a Category 5 super typhoon with 1-minute sustained winds of 270 km/h (165 mph) as the storm began to weaken slightly. [20] [21] At 15:00 UTC on September 11, Chanthu weakened to a Category 4-equivalent typhoon as it continued to move northward because of the presence of dry air. [22] It was further downgraded to a Category 3-equivalent typhoon by the JTWC on September 12 at 03:00 UTC as it moved towards the east coast of Taiwan, experiencing multiple eyewall replacement cycles, increasing wind shear and dry, stable air. [23] Three hours later, the PAGASA issued its last bulletin on the system since it had exited the PAR. [24] At 15:00 UTC, Chanthu weakened to a Category 2-equivalent typhoon as the dry air started to hamper the typhoon's convective structure. According to satellite imagery, the low-level circulation center had become ill-defined and the eye started to collapse. [25] The weakening trend of Chanthu continued as it moved further northward towards the Korean Peninsula because of increasing wind shear, dry air and cool sea surface temperatures. [26] [27] At 09:00 UTC of September 13, Chanthu further weakened into a Category 1 typhoon as it moved further north towards Shanghai. [28] By 15:00 UTC, the eye of Chanthu had completely collapsed. [29] Chanthu remained quasi-stationary near Shanghai because of weak steering flow. [30] [31] At 06:00 UTC the next day, the JMA downgraded Chanthu to a severe tropical storm as it moved southeastward. [32] Three hours later, the JTWC downgraded Chanthu to a tropical storm as its low-level circulation became partially exposed, with convection only remaining to the north and west. [33] At 12:00 UTC, the JMA further downgraded it to a tropical storm as it slowly moved south-eastward towards Japan. [34] At 00:00 UTC on September 15, due to decreasing wind shear and marginally favorable sea surface temperatures, Chanthu re-strengthened and was re-classified as a severe tropical storm that day. [35] After continued slow movement, on September 17 at 09:00 UTC, Chanthu made landfall near itsuki, Nagasaki in Japan. [36] It continued to move northward as it moved through the rugged Japanese islands, causing it to weaken significantly. [37] This caused the JMA to downgrade it to a tropical storm at 12:00 UTC. [38] At 21:00 UTC, the JTWC downgraded it to a tropical depression as it rapidly collapsed because of the rugged terrain; it was also undergoing extratropical transition. [39] On September 18 at 08:00 UTC, the JTWC issued its final warning for the system, as the system became extratropical. [40] Afterward, Chanthu's remnant continued moving eastward and then curved southward, before dissipating on September 20.

Preparations

In the Philippines, 415 people were evacuated. [41] As Chanthu came closer towards Luzon, the PAGASA issued Signal No. 1 warnings over Cagayan and Isabela provinces. [42] At 23:00 PhST of September 9, the PAGASA raised a Signal No. 2 warning over the northeastern portion of Cagayan and eastern portion of Babuyan and Signal No. 1 was further extended over Batanes, rest of Cagayan and Babuyan, northeastern portion of Apayao and eastern portion of Isabela. [43] At 05:00 PhST the next day, a Signal No. 3 warning was raised over Santa Ana, Cagayan. [44]

At 05:30 NST of September 10, the Central Weather Bureau in Taiwan issued a sea warning, [45] which was followed by a land warning for Super Typhoon Chanthu. [46] At 17:00 PhST, the PAGASA raised a Signal No. 4 warning over the northeastern portion of Babuyan Islands. [47] President of Taiwan, Tsai Ing-wen advised people to stay indoors due to torrential rain and strong winds. [41] Transportation in Taiwan was also halted, with over 100 flights, [48] trains and 46 ferries to Matsu and other surrounding islands cancelled. [41] Around 2,000 people in landslide-prone areas in the eastern portions of Hualien County were evacuated, and sections of highway in the area were closed by authorities. The Taiwanese Defence Ministry put 31,000 troops on standby. [48]

The storm shut down both China's Shanghai Port and the Port of Ningbo-Zhoushan, the world's largest port by cargo throughput, between September 12–14. About 86 vessels were left waiting outside the ports. [49]

Impact

Philippines

Satellite animation of Typhoon Chanthu skirting northeastern Luzon on September 10 Typhoon Chanthu september 10.gif
Satellite animation of Typhoon Chanthu skirting northeastern Luzon on September 10

The Batanes Islands suffered a direct hit from Chanthu, which destroyed infrastructure and caused power outages there. Some local residents called it "the strongest typhoon" they had seen. [50] More than 30,000 residents were affected in the Ilocos, Cagayan Valley, Central Luzon and the Cordillera Administrative Region. Four municipalities lost power, and one municipality experienced a water supply outage; those services were not restored as of September 15. There were also reports of landslides and flooding, mostly from Ilocos and Central Luzon. According to the National Disaster Risk Reduction and Management Council (NDRRMC), total damages from the typhoon were up to ₱37.4 million (US$748,000). [51]

Taiwan

The eastern portions of Hualien and Taitung counties received around 200 mm (7.9 in) of rain from the typhoon. The storm brought waves of up to 7 m (23 ft) on Orchid Island. Authorities reported that 26,000 houses lost power. [52] The capital city of Taiwan, Taipei, also received heavy rainfall. Winds up to 164 km/h (102 mph) were reported. [53]

South Korea

As Chanthu passed near the island of Jeju, it caused winds up to 30 to 40 m/s (110 to 145 km/h; 65 to 90 mph) and 50 mm (2.0 in) of rainfall. There were reports of structural damage and overwhelmed drainage systems on the island. 23 flights were grounded and 48 ferry sailings were cancelled. [54]

Japan

Chanthu left seven people injured across Japan while it traversed the country as a weakening system. Train services were suspended and flights cancelled as a result of adverse weather. Over 7,000 households on Kyushu lost power. In Mihama, Wakayama, strong winds damaged the roofs of 50 houses and shattered several windows. [55]

See also

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References

  1. ↑ "PAGASA redefines 'super typhoon', revises wind signals". ABS-CBN News. March 23, 2022. Retrieved August 29, 2022.
  2. ↑ Global Catastrophe Recap: October 2020 (PDF) (Report). Aon Benfield Inc. October 2020. Archived (PDF) from the original on November 11, 2021. Retrieved November 11, 2021.
  3. ↑ Significant Advisory for Western and Southern Pacific (Report). United States Joint Typhoon Warning Center. 6 September 2021. Archived from the original on 5 September 2021. Retrieved 6 September 2021. Alt URL
  4. ↑ "JMA Weather and Summary 051800". Tokyo, Japan: Japan Meteorological Agency. September 5, 2021. Archived from the original on September 6, 2021. Retrieved September 6, 2021.
  5. ↑ Tropical Cyclone Formation Alert (Invest 95W) (Report). United States Joint Typhoon Warning Center. 6 September 2021. Archived from the original on 5 September 2021. Retrieved 6 September 2021. Alt URL
  6. ↑ Tropical Depression 19W (Nineteen) Warning No. 1 (Report). United States Joint Typhoon Warning Center. 6 September 2021. Archived from the original on 6 September 2021. Retrieved 6 September 2021. Alt URL
  7. ↑ Prognostic Reasoning for Tropical Storm 19W (Nineteen) Warning No. 3 (Report). United States Joint Typhoon Warning Center. 6 September 2021. Archived from the original on 6 September 2021. Retrieved 7 September 2021. Alt URL
  8. ↑ "RSMC Prognostic Reasoning No. 3 for Tropical Storm Chanthu (2114)". Tokyo, Japan: Japan Meteorological Agency. September 5, 2021. Archived from the original on September 7, 2021. Retrieved September 6, 2021.
  9. ↑ "Tropical Cyclone Bulletin #1 for Typhoon 'Kiko' (Chanthu)" (PDF). PAGASA . 7 September 2021. Archived from the original (PDF) on 7 September 2021. Retrieved 7 September 2021. Alt URL
  10. ↑ "RSMC Prognostic Reasoning No. 5 for Severe Tropical Storm Chanthu (2114)". Tokyo, Japan: Japan Meteorological Agency. September 7, 2021. Archived from the original on September 7, 2021. Retrieved September 7, 2021.
  11. ↑ Prognostic Reasoning for Typhoon 19W (Chanthu) Warning No. 5 (Report). United States Joint Typhoon Warning Center. 7 September 2021. Archived from the original on 7 September 2021. Retrieved 7 September 2021. Alt URL
  12. ↑ Prognostic Reasoning for Typhoon 19W (Chanthu) Warning No. 6 (Report). United States Joint Typhoon Warning Center. 7 September 2021. Archived from the original on 7 September 2021. Retrieved 7 September 2021. Alt URL
  13. ↑ Prognostic Reasoning for Typhoon 19W (Chanthu) Warning No. 6A (Report). United States Joint Typhoon Warning Center. 7 September 2021. Retrieved 7 September 2021.{{cite report}}: |archive-date= requires |archive-url= (help)
  14. ↑ Prognostic Reasoning for Typhoon 19W (Chanthu) Warning No. 7 (Report). United States Joint Typhoon Warning Center. 7 September 2021. Archived from the original on 7 September 2021. Retrieved 8 September 2021. Alt URL
  15. ↑ Category 4-Equivalent Super Typhoon 19W (Chanthu) Warning No. 9 (Report). United States Joint Typhoon Warning Center. 8 September 2021. Archived from the original on 8 September 2021. Retrieved 8 September 2021.
  16. ↑ Prognostic Reasoning for Category 4-Equivalent Super Typhoon 19W (Chanthu) Warning No. 9 (Report). United States Joint Typhoon Warning Center. 8 September 2021. Archived from the original on 8 September 2021. Retrieved 8 September 2021.
  17. ↑ Prognostic Reasoning for Category 4-Equivalent Super Typhoon 19W (Chanthu) Warning No. 13 (Report). United States Joint Typhoon Warning Center. 9 September 2021. Archived from the original on 9 September 2021. Retrieved 9 September 2021. Alt URL
  18. ↑ Prognostic Reasoning for Category 4-Equivalent Super Typhoon 19W (Chanthu) Warning No. 17 (Report). United States Joint Typhoon Warning Center. 10 September 2021. Archived from the original on 10 September 2021. Retrieved 10 September 2021. Alt URL
  19. ↑ "Tropical Cyclone Bulletin #19 for Typhoon 'Kiko' (Chanthu)" (PDF). PAGASA . 9 September 2021. Archived from the original (PDF) on 7 September 2021. Retrieved 9 September 2021. Alt URL
  20. ↑ @dost_pagasa (September 11, 2021). "At 8:30 AM today, Typhoon #KikoPH made landfall over Ivana, Batanes" (Tweet) – via Twitter.
  21. ↑ @dost_pagasa (September 11, 2021). "TROPICAL CYCLONE BULLETIN NO. 21 Typhoon "#KikoPH" (CHANTHU) Issued at 11 AM, 11 September 2021 Valid for broadcast until the next bulletin at 2 PM today "KIKO" SLIGHTLY WEAKENS AND IS NOW MOVING OVER THE COASTAL WATERS OF ITBAYAT, BATANES" (Tweet) – via Twitter.
  22. ↑ Prognostic Reasoning for Typhoon 19W (Chanthu) Warning No. 22 (Report). United States Joint Typhoon Warning Center. 11 September 2021. Archived from the original on 11 September 2021. Retrieved 13 September 2021. Alt URL
  23. ↑ Prognostic Reasoning for Typhoon 19W (Chanthu) Warning No. 23 (Report). United States Joint Typhoon Warning Center. 12 September 2021. Archived from the original on 12 September 2021. Retrieved 13 September 2021. Alt URL
  24. ↑ "Tropical Cyclone Bulletin #29-FINAL for Typhoon 'Kiko' (Chanthu)" (PDF). PAGASA . 12 September 2021. Archived from the original (PDF) on 7 September 2021. Retrieved 12 September 2021. Alt URL
  25. ↑ Prognostic Reasoning for Typhoon 19W (Chanthu) Warning No. 26 (Report). United States Joint Typhoon Warning Center. 12 September 2021. Archived from the original on 12 September 2021. Retrieved 13 September 2021. Alt URL
  26. ↑ Prognostic Reasoning for Typhoon 19W (Chanthu) Warning No. 27 (Report). United States Joint Typhoon Warning Center. 12 September 2021. Archived from the original on 12 September 2021. Retrieved 13 September 2021. Alt URL
  27. ↑ Prognostic Reasoning for Typhoon 19W (Chanthu) Warning No. 28 (Report). United States Joint Typhoon Warning Center. 13 September 2021. Archived from the original on 13 September 2021. Retrieved 13 September 2021. Alt URL
  28. ↑ Prognostic Reasoning for Typhoon 19W (Chanthu) Warning No. 29 (Report). United States Joint Typhoon Warning Center. 13 September 2021. Archived from the original on 13 September 2021. Retrieved 13 September 2021. Alt URL
  29. ↑ Prognostic Reasoning for Typhoon 19W (Chanthu) Warning No. 30 (Report). United States Joint Typhoon Warning Center. 13 September 2021. Archived from the original on 13 September 2021. Retrieved 14 September 2021. Alt URL
  30. ↑ "RSMC Prognostic Reasoning No. 31 for Typhoon 2114 (Chanthu)". Tokyo, Japan: Japan Meteorological Agency. September 14, 2021. Archived from the original on September 14, 2021. Retrieved September 14, 2021.
  31. ↑ Prognostic Reasoning for Typhoon 19W (Chanthu) Warning No. 32 (Report). United States Joint Typhoon Warning Center. 14 September 2021. Archived from the original on 14 September 2021. Retrieved 14 September 2021. Alt URL
  32. ↑ "RSMC Prognostic Reasoning No. 32 for Severe Tropical Storm 2114 (Chanthu)". Tokyo, Japan: Japan Meteorological Agency. September 14, 2021. Archived from the original on September 14, 2021. Retrieved September 14, 2021.
  33. ↑ Prognostic Reasoning for Tropical Storm 19W (Chanthu) Warning No. 33 (Report). United States Joint Typhoon Warning Center. 14 September 2021. Archived from the original on 14 September 2021. Retrieved 14 September 2021. Alt URL
  34. ↑ "RSMC Prognostic Reasoning No. 33 for Tropical Storm 2114 (Chanthu)". Tokyo, Japan: Japan Meteorological Agency. September 14, 2021. Archived from the original on September 14, 2021. Retrieved September 14, 2021.
  35. ↑ "RSMC Prognostic Reasoning No. 39 for Severe Tropical Storm 2114 (Chanthu)". Tokyo, Japan: Japan Meteorological Agency. September 16, 2021. Archived from the original on September 16, 2021. Retrieved September 18, 2021.
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  37. ↑ Prognostic Reasoning for Tropical Storm 19W (Chanthu) Warning No. 46 (Report). United States Joint Typhoon Warning Center. 17 September 2021. Archived from the original on 17 September 2021. Retrieved 18 September 2021. Alt URL
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  39. ↑ Prognostic Reasoning for Tropical Depression 19W (Chanthu) Warning No. 47 (Report). United States Joint Typhoon Warning Center. 17 September 2021. Archived from the original on 17 September 2021. Retrieved 18 September 2021. Alt URL
  40. ↑ Tropical Depression 19W (Chanthu) Warning No. 48-FINAL (Report). United States Joint Typhoon Warning Center. 18 September 2021. Archived from the original on 18 September 2021. Retrieved 18 September 2021. Alt URL
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  55. ↑ "7 hurt as Typhoon Chanthu traverses Japan, weakens". Kyodo News. September 18, 2021. Archived from the original on September 19, 2021. Retrieved September 20, 2021.
Typhoon Chanthu (Kiko)
Chanthu 2021-09-10 0530Z.png
Typhoon Chanthu shortly before peak intensity on September 10
Tropical cyclones of the 2021 Pacific typhoon season
2021 Pacific typhoon season summary.png
TD
TD
TS
Dujuan
TD
TD
VITY
Surigae
TD
Crising
TS
Choi-wan
TD
TD
TS
Koguma
TY
Champi
TD
TD
TD
Emong
TD
08W
VSTY
In-fa
TY
Cempaka
TD
TD
TS
Nepartak
TD
TD
TD
TD
TD
TD
TD
TD
TD
12W
TS
Lupit
STS
Mirinae
STS
Nida
TS
Omais
TD
17W
STS
Conson
VITY
Chanthu
TD
TD
VITY
Mindulle
TS
Dianmu
TD
TD
TS
Lionrock
STS
Kompasu
TD
Nando
STS
Namtheun
TY
Malou
TD
26W
VSTY
Nyatoh
VITY
Rai
TD
29W
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